Nontransparent and glossy capsule of regenerated cellulose and process of preparing same



V Patented Oct. 1 4, 1930 UNETED STATES PATENT OFFICE JULIUS VOSS AND OTTO SCHNECKO, OF BIEBRIC H-ON-RHINE, GERMANY, ASSIGNORS TO KALLE & CO. AKTIENGESELLSGHAFT, OF BIEBRIGH-ON-RHINE, GERMANY, A

CORPORATION OF GERMANY NONTRANSPARENT AND GLOSSY CAPSULE OF REGENERATED CELLULOSE AND PROCESS OF PREPARING SAME No Drawing. Application filed November 5, 1926, Serial No. 146,560, and in Germany November 6, 1925.

lVe have found that non-transparent and glossy capsules or caps are obtainable by causing an insoluble compound to be precipitated upon one side of a glossy capsule while taking care that the other side remains 10 unaltered. l/Ve prefer to carry out the process in such a way that we produce the insoluble precipitate on the capsule while it is still on the shaped patterns by Which it is formed. I

If, for instance, the viscose material applied on to the pattern is first dipped into a coagulating bath containing barium chloride and then through a bath containing a soluble sulfate, there is obtained a precipitate of barium sulfate which adheres only to the external surface of the capsules. The capsules are then turned inside out and washed or treated in any desired or known manner.

1 Capsules thus formed will dry out with a glossy exterior surface, the non-transparent film formed by the precipitate being on the inside.

In an analogous manner may be produced in the cap other precipitates, as for instance of copper sulfide, lead sulfate, barium chromate, copper or the like.

The above described processes may also be employed for the manufacture of capsules with a metallic lustre for which purpose hollow bodies, containing mica or mosaic gold (stannic sulphide) or a mixture of both, are to be used as starting material. The capsules manufactured in this manner have over the capsules containing only mica or mosaic gold the advantage of possessing a higher covering power.

For the purpose of our new process there may, for instance, be used a viscose material composed of 5% of alkali, 6% of cellulose and 2% of mica. The shaping-patterns are immersed into the mass and are then dipped, as above indicated, into a coagulation bath containing barium chloride and subsequently into a bath containing a soluble sulfate. Finally the cap is treated in the usual manner. In this way a cap is obtained the outward surface of which has a metallic lustre.

We claim:

1. Non-transparent and glossy capsules of regenerated cellulose, the inner side of said capsule being covered with an insoluble prepipitate and the outside showing a glossy surace.

2. A non-transparent and glossy capsule of regenerated cellulose, the inner side 0 said capsule being covered with an insoluble precipitate of an inorganic compound and the outside showing a glossy surface.

3. A non-transparent and glossy capsule of regenerated cellulose, the inner side of said capsule being covered with an insoluble precipitate of barium sulfate and the outside showing a glossy surface.

4. The process which comprises causing an insoluble compound to be precipitated upon one side of a capsule of regenerated cellulose while taking care that the other side remains unaltered.

5. The process which comprises treating a capsule made of regenerated cellulose while still being on the shaped pattern with a solution of barium chloride and then with a solution of a water soluble salt of sulfuric acid.

In testimony whereof we hereunto aflix our signatures.

DR. JULIUS VOSS. DR. OTTO SCHNECKO. 

